Superconductivity and crystalline electric field effects in the filled skutterudite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>PrRu</mml:mtext></mml:mrow><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Sayles, T. A.; Baumbach, Ryan; Yuhasz, W. M.; Maple, M. B.; Bochenek, Ł.; Wawryk, R.; Cichorek, T.; Pietraszko, A.; Henkie, Z.; Ho, Pei-Chun

doi:10.1103/physrevb.82.104513

Cited by 16 publications

(7 citation statements)

References 36 publications

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“…The electronic specific heat coefficient γ is consistently below 100 mJ/mol K 2 with only PrOs 4 Sb 12 having a significantly larger value of γ ≈ 600 mJ/mol K 2 . 2,9,50,51 The Debye temperature Θ D exhibits values near 200 K except in PrRu 4 As 12 with Θ D = 344 K. 9,53,54 While many of the Pr-based skutterudites have values of T c between 1-2 K, PrPt 4 Ge 12 is unique with T c = 7.9 K. The ratio ∆/k B T c is also enhanced for PrPt 4 Ge 12 relative to the other compounds, exhibiting values of approximately 2.3. It is interesting to observe that many of the properties of these Pr-based superconducting filled skutterudites are very similar, despite the different atomic cages within which the Pr ions reside.…”

Section: Discussionmentioning

confidence: 99%

Probing the superconductivity ofPrPt4Ge12through Ce substitution

et al. 2014

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We report measurements of electrical resistivity, magnetic susceptibility, specific heat, and thermoelectric power on the system Pr1−xCexPt4Ge12. Superconductivity is suppressed with increasing Ce concentration up to x = 0.5, above which there is no evidence for superconductivity down to 1.1 K. The Sommerfeld coefficient γ increases with increasing x from ∼48 mJ/mol K 2 up to ∼120 mJ/mol K 2 at x = 0.5, indicating an increase in strength of electronic correlations. The temperature dependence of the specific heat at low temperatures evolves from roughly T 3 for x = 0 to e −∆/T behavior for x = 0.05 and above, suggesting a crossover from a nodal to a nodeless superconducting energy gap or a transition from multiband to single band superconductivity. Fermiliquid behavior is observed throughout the series in low temperature magnetization, specific heat, and electrical resistivity measurements.

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Section: Discussionmentioning

confidence: 99%

Probing the superconductivity ofPrPt4Ge12through Ce substitution

et al. 2014

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“…Other examples are cubic PrIn 3 [68], hexagonal PrCu 5 , orthorhombic PrCu 6 [69], and a number of other metallic Pr 3+ systems showing the CF effect. It is worth mentioning that of the caged systems such as the PrRu 4 As 12 skutterudite [70] and others, the ρ(T) function has also been analyzed in terms of the CF model. None of these systems show magnetic ordering, down to the lowest temperature measured, since their ground state is a non-magnetic CF singlet.…”

Section: Transport Properties 251 Electrical Resistivitymentioning

confidence: 99%

Anomalous rattling and single crystalline properties of the caged compound URu2Al10

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Samsel‐Czekała

et al. 2018

Journal of Alloys and Compounds

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We report on an experimental single-crystal study of URu 2 Al 10 , crystallizing in the YbFe 2 Al 10 type orthorhombic structure, supplemented by the results of crystal field and band structure calculations. We investigated the magnetic, thermal and transport properties of this caged-type compound. Based on the local character of the 5f 2 −electron configuration of the U 4+ ion in URu 2 Al 10 , the effective crystal field (CF) potential in the intermediate coupling form was estimated using the CF level scheme, composed only of singlets. This was carried out in a similar manner to that reported for UFe 2 Al 10 [Phys. Rev. B 92 (2015) 104427]. The obtained scheme satisfactorily reproduces both the magnetic susceptibility (measured along the three main crystallographic directions) and the Schottky-type anomaly of the specific heat. The latter was estimated using the specific heat data of ThRu 2 Al 10 as a phonon reference. In addition, the strong anisotropic behavior of the Seebeck coefficient measured along the three principal directions, and its low-temperature pronounced maxima, have been approximately explained by the CF effect. The latter dominates in the S-shaped temperature dependencies of the electrical resistivity, measured using the current flowing along the three main axes. However, the magnetoresistivity reveals an anisotropic electronic structure that could originate from a c-f hybridization effect in an orthorhombic unit cell. This gives rise to the typical metallic character of URu 2 Al 10 , as is also the case for UFe 2 Al 10 . This behavior underlines the dual character of the 5f-electrons in these ternaries. In turn, the presence of low-frequency Einstein modes reflects the presence of regular rattling of the U 4+ ion located in the [Ru 4 Al 16 ] cage. This rattling is, however, disturbed at low temperatures by applying an external magnetic field which causes strong scattering of the experimental electrical resistivity points. This effect is also anisotropic, as proved by a comparison of the resistivity results determined at zero and 9 T for a singlecrystalline sample of URu 2 Al 10 . The above effect also exists for isostructural UFe 2 Al 10 , but its anisotropy is less apparent.

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“…2(b)]. Although for both materials some signatures of multigap superconductivity were reported [49,50], a single-band BCS model accounts well for their H c1 ðTÞ data in the entire temperature range of study, as discussed below.…”

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confidence: 65%

“…3(c). Furthermore, even the presence of noninteracting localized 4f electrons, as shown for PrRu 4 As 12 which is considered to be a conventional paramagnetic metal [49], does not induce an anisotropy of phonon-mediated pairing. Studies at very low temperatures, i.e., at T < 0.1T b c ð≃0.05 KÞ where the α ¼ 1.25 model is expected to saturate, could help to develop a detailed understanding of all these observations but this would require a highly elaborated approach.…”

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confidence: 96%